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How to configure LLDP for Extreme switches to recognize IP phones

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TitleHow to configure LLDP for Extreme switches to recognize IP phones
Objective
Configure an Extreme EXOS switch to advertise it's LLDP capabilities to configure most IP phones.
Environment
  • EXOS
  • Summit
  • BlackDiamond
  • Polycom
  • Cisco
  • ShoreTel
  • LLDP
Procedure
LLDP Is a industry standard protocol that allows devices to advertise, and discover connected devices, and there capabilities.  In this procedure we are configuring the switch port to advertise supported POE wattage, VLAN assignment, and DSCP values the phone will be using.

The VLAN that is being used for VOIP traffic needs to be tagged on the port the phone is connected to.
  • configure vlan <VOIP vlan> add ports <port number> tagged
The following mandatory TLVs are not configured by default in EXOS:
  • LLDP-MED Capabilities
  • LLDP-MED Network Policy
  • LLDP-MED Extended Power-Via-MDI TLV
Use the following commands to configure them and allow the switch to communicate with the phone via LLDP:
  • enable lldp ports <port number>
  • configure lldp port <port number> advertise vendor-specific med capabilities
  • configure lldp port <port number> advertise vendor-specific dot1 vlan-name vlan <VOIP vlan>
  • configure lldp port <port number> advertise vendor-specific med power-via-mdi
  • configure lldp port <port number> advertise vendor-specific med policy application voice vlan <VOIP vlan> dscp 46
  • Configure lldp port <port number> advertise system-capabilities
  • Configure lldp port <port number> advertise vendor-specific dot1 port-protocol-vlan-id vlan <VOIP vlan>
Additional notes
MED: Media Endpoint Discovery
dot1: 802.1 Vlan assignment
Power via MDI: For Ethernet (PoE) or PoE+ ports, this TLV advertises the device type, power status, power class, and pin pairs used to supply power.

This is also applicable if any other vendor's AP is not powering up.

Related articles:
How to enable CDP version 2 to advertise POE+ capabilities

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